Wouter Hanegraaff discovered that the TIFF library did not sufficiently validate the "YCbCr subsampling" value in TIFF image headers. Decoding a malicious image with a zero value resulted in an arithmetic exception, which can cause a program that uses the TIFF library to crash.

wxPythonGTK uses an embedded libtiff source tree, and as such has the same vulnerability.

The updated packages have been rebuilt using the system libraries and should now incorporate all the updates to libjpeg, libpng, libtiff and zlib.